I have problems uploading the updates of all my app in the Play Store, I had done it before without problems. The error that is generated is the following:

Error in loading

You uploaded a signed APK file with a different certificate than the one used to sign your previous APKs. You must use the same certificate. The certificates you used to sign your current APK files have fingerprints.

You uploaded a signed APK file with a different certificate than the one used to sign your previous APKs. You must use the same certificate. The certificates you used to sign your current APK files have fingerprints.

You mean update for publishing new versions of your apps to Google Play Store?
If yes, as I mentioned, somehow you have overwritten your existing AppyBuilder keystore. There is only ONE keystore for all your apps

Hugo_Alfonso_Gamez_S:

You uploaded a signed APK file with a different certificate than the one used to sign your previous APKs. You must use the same certificate. The certificates you used to sign your current APK files have fingerprints.